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Communication | Regular issue | Vol 16, No. 2, 1981, pp.235-238
Published online, 1st January, 1970
DOI: 10.3987/R-1981-02-0235
Some Novel Reactions of Benzoxazole Derivatives with Dimethyl Acetylenedicarboxylate II

Norio Kawahara,* Michihiko Katsuyama, Tsuneo Itoh, and Haruo Ogura

*Hokkaido College of Pharmacy, 7-1 Katsuraoka-cho, Otaru 047-02, Japan

Abstract

2-Alkylbenzoxazole derivatives (1) reacted with dimethyl acetylenedicarboxylate (DMAD) in alcoholic solvents at room temperature to afford tricyclic compound (2), hydration product (3), solvent adduct (5) and ring-opened compounds (4 and 6). And the ring-opened compound (6) is a main product of photocycloaddition reaction of 1 with DMAD.